Perhaps you should try some spelling variations:
significantly improved » significantly increased (Expand Search)
improved decrease » improved urease (Expand Search), marked decrease (Expand Search)
significantly i » significantly _ (Expand Search), significantly high (Expand Search), significantly less (Expand Search)
i decrease » _ decrease (Expand Search), a decrease (Expand Search), _ decreased (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( significantly improved decrease ) OR ( significantly i decrease ))~.